公开(公告)号：US08957940B2

公开(公告)日：2015-02-17

申请号：US13793524

申请日：2013-03-11

Applicant: Cisco Technology, Inc.

Inventor： Dihong Tian

IPC: H04N7/14 ,  H04N5/262 ,  G06K9/00 ,  H04N5/232 ,  H04N7/15

CPC classification number: H04N5/23238 ,  G06K9/00228 ,  H04N5/23219 ,  H04N5/23296 ,  H04N5/247 ,  H04N5/2621 ,  H04N7/15

Abstract: Video content is received at a computing device that camera views provided by video cameras that are aligned to capture images of participants within a defined space. Each camera view is at a first resolution and the video cameras are aligned such that a field of view (FOV) for each camera overlaps a portion of the FOV of at least one other adjacent camera. Positions of participants depicted within the video content are detected, where at least one participant is captured by overlapping FOVs of two adjacent camera views. A target view is generated from the first number of camera views, the target view having a second resolution that is lower than the first resolution, and the target view includes a view of the at least one participant captured within the overlapping FOVs of two adjacent camera views. The target view is displayed at a display device.

Abstract translation: 在计算设备处接收视频内容，该摄像机视图由摄像机提供，其被对齐以捕获在定义的空间内的参与者的图像。 每个摄像机视图处于第一分辨率并且摄像机被对准，使得每个摄像机的视场（FOV）与至少一个其他相邻摄像机的FOV的一部分重叠。 检测到在视频内容内描绘的参与者的位置，其中通过两个相邻摄像机视图的重叠FOV捕获至少一个参与者。 从第一数量的相机视图产生目标视图，目标视图具有低于第一分辨率的第二分辨率，并且目标视图包括在两个相邻相机的重叠FOV内捕获的至少一个参与者的视图 意见 目标视图显示在显示设备上。

公开(公告)号：US20140292999A1

公开(公告)日：2014-10-02

申请号：US13867697

申请日：2013-04-22

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Dau Do ,  Nermin Ismail ,  Brandon Gulrich ,  Dihong Tian

IPC: G06F17/24 ,  H04N7/15

CPC classification number: G06F17/241 ,  H04L65/403 ,  H04L65/602 ,  H04L65/608 ,  H04N7/15 ,  H04N7/155

Abstract: A processing system can include an encoder to encode a real-time transmission of a presentation. A memory buffer can copy and store images of the presentation and convert the images into snapshot images. A transmitter can transmit the snapshot images to an external annotation device, and a receiver can receive annotation data of an annotation performed on the snapshot images at the external annotation device. The annotation can be encoded, in accordance with the annotation data, into the real-time transmission of the presentation to display the real-time transmission with the annotation.

Abstract translation: 处理系统可以包括编码器来编码呈现的实时传输。 内存缓冲区可以复制和存储演示文稿的图像，并将图像转换为快照图像。 发送器可以将快照图像发送到外部注释设备，并且接收器可以接收在外部注释设备上对快照图像执行的注释的注释数据。 注释可以根据注释数据被编码成呈现的实时传输以用注释显示实时传输。

公开(公告)号：US09392226B2

公开(公告)日：2016-07-12

申请号：US14524305

申请日：2014-10-27

Applicant: Cisco Technology, Inc.

Inventor： Dihong Tian ,  J. William Mauchly ,  Joseph T. Friel

IPC: H04N7/14 ,  H04N7/15

CPC classification number: H04N7/152 ,  H04N7/147 ,  H04N7/15

Abstract: Techniques are provided for establishing a videoconference session between participants at different endpoints, where each endpoint includes at least one computing device and one or more displays. A plurality of video streams is received at an endpoint, and each video stream is classified as at least one of a people view and a data view. The classified views are analyzed to determine one or more regions of interest for each of the classified views, where at least one region of interest has a size smaller than a size of the classified view. Synthesized views of at least some of the video streams are generated, wherein the synthesized views include at least one view including a region of interest, and views including the synthesized views are rendered at one or more displays of an endpoint device.

Abstract translation: 提供了用于在不同端点的参与者之间建立视频会议会话的技术，其中每个端点包括至少一个计算设备和一个或多个显示器。 在端点处接收多个视频流，并且将每个视频流分类为人视图和数据视图中的至少一个。 分析分类视图以确定每个分类视图的一个或多个感兴趣区域，其中至少一个感兴趣区域的尺寸小于分类视图的尺寸。 生成至少一些视频流的合成视图，其中合成视图包括至少一个包括感兴趣区域的视图，并且包括合成视图的视图在端点设备的一个或多个显示处呈现。

公开(公告)号：US08854412B2

公开(公告)日：2014-10-07

申请号：US13624058

申请日：2012-09-21

Applicant: Cisco Technology, Inc.

Inventor： Dihong Tian ,  J. William Mauchly ,  Joseph T. Friel

IPC: H04N7/14

CPC classification number: H04N7/15 ,  G06T5/008 ,  G06T2207/10016 ,  G06T2207/10144 ,  G06T2207/20012 ,  G06T2207/20208

Abstract: Video frames are captured at one or more cameras during a video conference session, where each video frame includes a digital image with a plurality of pixels. Depth values associated with each pixel are determined in at least one video frame, where each depth value represents a distance of a portion of the digital image represented by at least one corresponding pixel from the one or more cameras that capture the at least one video frame. Luminance values of pixels are adjusted within captured video frames based upon the depth values determined for the pixels so as to achieve relighting of the video frames as the video frames are displayed during the video conference session.

Abstract translation: 在视频会议期间，在一个或多个摄像机处捕获视频帧，其中每个视频帧包括具有多个像素的数字图像。 在至少一个视频帧中确定与每个像素相关联的深度值，其中每个深度值表示由至少一个对应像素表示的数字图像的一部分的距离，该距离来自一个或多个拍摄至少一个视频帧的相机 。 基于为像素确定的深度值，在捕获的视频帧内调整像素的亮度值，以便在视频会议期间显示视频帧时实现视频帧的重新点亮。

公开(公告)号：US20140254688A1

公开(公告)日：2014-09-11

申请号：US13790315

申请日：2013-03-08

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Dihong Tian ,  Jennifer Sha

IPC: H04N7/26

CPC classification number: H04N21/440281 ,  G06F3/1462 ,  G09G5/393 ,  H04N21/44008 ,  H04N21/4788

Abstract: Techniques are provided for receiving and decoding a sequence of video frames at a computing device, and analyzing a current video frame N to determine whether to skip or render the current video frame N for display by the computing device. The analyzing includes generating color histograms of the current video frame N and one or more previous video frames, determining a difference value representing a difference between the current video frame N and a previous video frame N−K, where K>0, the difference value being based upon the generated color histograms, in response to the difference value not exceeding a threshold value, rendering the current video frame N or a recently rendered video frame N−K using the current video frame, and in response to the difference value exceeding the threshold value, skipping the current video frame N from being rendered.

Abstract translation: 提供技术用于在计算设备处接收和解码视频帧序列，并且分析当前视频帧N以确定是否跳过或呈现当前视频帧N以供计算设备显示。 该分析包括生成当前视频帧N和一个或多个先前视频帧的颜色直方图，确定表示当前视频帧N和先前视频帧N-K之间的差的差值，其中K> 0，差值 基于生成的颜色直方图，响应于不超过阈值的差值，使用当前视频帧渲染当前视频帧N或最近渲染的视频帧N-K，并且响应于该差值超过阈值 阈值，跳过当前视频帧N的渲染。

公开(公告)号：US20140085398A1

公开(公告)日：2014-03-27

申请号：US13624058

申请日：2012-09-21

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Dihong Tian ,  J. William Mauchly ,  Joseph T. Friel

IPC: H04N7/14

CPC classification number: H04N7/15 ,  G06T5/008 ,  G06T2207/10016 ,  G06T2207/10144 ,  G06T2207/20012 ,  G06T2207/20208

Abstract: Video frames are captured at one or more cameras during a video conference session, where each video frame includes a digital image with a plurality of pixels. Depth values associated with each pixel are determined in at least one video frame, where each depth value represents a distance of a portion of the digital image represented by at least one corresponding pixel from the one or more cameras that capture the at least one video frame. Luminance values of pixels are adjusted within captured video frames based upon the depth values determined for the pixels so as to achieve relighting of the video frames as the video frames are displayed during the video conference session.

Abstract translation: 在视频会议期间，在一个或多个摄像机处捕获视频帧，其中每个视频帧包括具有多个像素的数字图像。 在至少一个视频帧中确定与每个像素相关联的深度值，其中每个深度值表示由至少一个对应像素表示的数字图像的一部分的距离，该距离来自一个或多个拍摄至少一个视频帧的相机 。 基于为像素确定的深度值，在捕获的视频帧内调整像素的亮度值，以便在视频会议期间显示视频帧时实现视频帧的重新点亮。

公开(公告)号：US09674550B2

公开(公告)日：2017-06-06

申请号：US14596589

申请日：2015-01-14

Applicant: Cisco Technology, Inc.

Inventor： Dihong Tian ,  Wing-Kuen Chung ,  Qing Chen

IPC: H04N19/593 ,  H04N19/159 ,  H04N5/232 ,  H04N5/235 ,  H04N9/73 ,  H04N5/228 ,  H04N5/225

CPC classification number: H04N19/593 ,  H04N5/225 ,  H04N5/228 ,  H04N5/232 ,  H04N5/23212 ,  H04N5/2353 ,  H04N9/735 ,  H04N19/159

Abstract: A controller controls a camera that produces a sequence of images and that has output coupled to a video encoder. The camera has an operating condition including a field of view and lighting, and one or more imaging parameters. The video encoder encodes images from the camera into codewords. The controller receives one or more encoding properties from the video encoder, and causes adjusting one or more of the imaging parameters based on at least one of the received encoding properties, such that the camera produces additional images of the sequence of images for the video encoder using the adjusted one or more imaging parameters.

公开(公告)号：US20150042748A1

公开(公告)日：2015-02-12

申请号：US14524305

申请日：2014-10-27

Applicant: Cisco Technology, Inc.

Inventor： Dihong Tian ,  J. William Mauchly ,  Joseph T. Friel

IPC: H04N7/15

CPC classification number: H04N7/152 ,  H04N7/147 ,  H04N7/15

Abstract: Techniques are provided for establishing a videoconference session between participants at different endpoints, where each endpoint includes at least one computing device and one or more displays. A plurality of video streams is received at an endpoint, and each video stream is classified as at least one of a people view and a data view. The classified views are analyzed to determine one or more regions of interest for each of the classified views, where at least one region of interest has a size smaller than a size of the classified view. Synthesized views of at least some of the video streams are generated, wherein the synthesized views include at least one view including a region of interest, and views including the synthesized views are rendered at one or more displays of an endpoint device.

Abstract translation: 提供了用于在不同端点的参与者之间建立视频会议会话的技术，其中每个端点包括至少一个计算设备和一个或多个显示器。 在端点处接收多个视频流，并且将每个视频流分类为人视图和数据视图中的至少一个。 分析分类视图以确定每个分类视图的一个或多个感兴趣区域，其中至少一个感兴趣区域的尺寸小于分类视图的尺寸。 生成至少一些视频流的合成视图，其中合成视图包括至少一个包括感兴趣区域的视图，并且包括合成视图的视图在端点设备的一个或多个显示处呈现。

公开(公告)号：US20140169453A1

公开(公告)日：2014-06-19

申请号：US14185403

申请日：2014-02-20

Applicant: Cisco Technology Inc.

Inventor： Dihong Tian ,  Wen-hsiung Chen ,  Pi Sheng Chang

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/196 ,  H04N19/167

CPC classification number: H04N19/124 ,  H04N19/13 ,  H04N19/167 ,  H04N19/176 ,  H04N19/196 ,  H04N19/60

Abstract: A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series.

Abstract translation: 一种编码方法，装置和介质，其上编码有软件以实现编码方法。 编码方法包括编码图像数据块的有序序列量化变换系数中的非零值系数的位置，包括使用可变长度编码的编码事件，该多个可变长度编码映射将事件映射到码字 ，位置编码包括基于上下文的代码映射之间的切换。 编码方法还包括使用可变维度幅度编码以与序列的原始顺序相反的顺序来编码非零值系数的幅度。

公开(公告)号：US08644384B2

公开(公告)日：2014-02-04

申请号：US13749588

申请日：2013-01-24

Applicant: Cisco Technology, Inc.

Inventor： Dihong Tian ,  J. William Mauchly ,  Joseph T. Friel ,  Wen-hsiung Chen

IPC: H04N11/02

CPC classification number: H04N19/00569 ,  H04N19/23 ,  H04N19/50 ,  H04N19/537 ,  H04N19/553 ,  H04N19/573 ,  H04N19/61

Abstract: A video coder includes a forward coder and a reconstruction module determining a motion compensated predicted picture from one or more previously decoded pictures in a multi-picture store. The reconstruction module includes a reference picture predictor that uses only previously decoded pictures to determine one or more predicted reference pictures. The predicted reference picture(s) are used for motion compensated prediction. The reference picture predictor may include optical flow analysis that uses a current decoded picture and that may use one or more previously decoded pictures together with affine motion analysis and image warping to determine at least a portion of at least one of the reference pictures.

Abstract translation: 视频编码器包括前向编码器和重构模块，其从多图像存储器中的一个或多个先前解码的图像确定运动补偿预测图像。 重建模块包括参考图像预测器，其仅使用先前解码的图像来确定一个或多个预测参考图像。 预测的参考图像用于运动补偿预测。 参考图像预测器可以包括使用当前解码图像的光流分析，并且可以使用一个或多个先前解码的图像以及仿射运动分析和图像扭曲来确定至少一个参考图片的至少一部分。